Simple Python code to retrieve all the servers with a open FTP port that allows anonymoys logins. Makes a txt file with the IPs afterwards.
Go to https://www.shodan.io/ and create a account, i would recommend to use your EDU account if you have one. They do lifetime account sales for 5$ on black friday and events. Grab those when you see them.
When you have made your account, grab they API key from the main page of your profile and insert it at line #9 in the code where it says key.
If you want to use more query tokens and go past 100 searches, uncomment the for loop above the check creds function and structure it propperly with a indentation
Enjoy!